Java Plugin for Iceweasel

I installed the sun-java6-plugin package on Debian, and iceweasel's about:plugins lists the Java plugin, but it can not really work.
Solution:

$ cd ~/.mozilla/plugins
$ ln -s /usr/lib/jvm/java-6-sun-1.6.0.07/jre/plugin/i386/ns7/libjavaplugin_oji.so